Merge pull request #300415 from ilyagr/pipx-completion

`pipx`: add shell completions

pkgs/development/python-modules/pipx/default.nix

@@ -4,6 +4,7 @@
 , fetchFromGitHub
 , hatchling
 , hatch-vcs
+, installShellFiles
 , packaging
 , platformdirs
 , pytestCheckHook
@@ -41,6 +42,10 @@ buildPythonPackage rec {
     tomli
   ];
 
+  nativeBuildInputs = [
+      installShellFiles
+  ];
+
   nativeCheckInputs = [
     pytestCheckHook
     git
@@ -79,6 +84,13 @@ buildPythonPackage rec {
     "test_skip_maintenance"
   ];
 
+  postInstall =  ''
+    installShellCompletion --cmd pipx \
+      --bash <(${argcomplete}/bin/register-python-argcomplete pipx --shell bash) \
+      --zsh <(${argcomplete}/bin/register-python-argcomplete pipx --shell zsh) \
+      --fish <(${argcomplete}/bin/register-python-argcomplete pipx --shell fish)
+  '';
+
   meta = with lib; {
     description = "Install and run Python applications in isolated environments";
     mainProgram = "pipx";